WO2018107775A1 - Procédé et dispositif de contrôle de parc éolien, et système de génération de puissance éolienne - Google Patents

Procédé et dispositif de contrôle de parc éolien, et système de génération de puissance éolienne Download PDF

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Publication number
WO2018107775A1
WO2018107775A1 PCT/CN2017/096412 CN2017096412W WO2018107775A1 WO 2018107775 A1 WO2018107775 A1 WO 2018107775A1 CN 2017096412 W CN2017096412 W CN 2017096412W WO 2018107775 A1 WO2018107775 A1 WO 2018107775A1
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Prior art keywords
power
wind
reactive power
grid
voltage
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PCT/CN2017/096412
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English (en)
Chinese (zh)
Inventor
乔元
张毅
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北京金风科创风电设备有限公司
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Publication of WO2018107775A1 publication Critical patent/WO2018107775A1/fr

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    • H02J3/386—
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/76—Power conversion electric or electronic aspects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation

Definitions

  • the invention relates to the technical field of wind power, and in particular to a control method and device for a wind farm and a wind power generation system.
  • a control method for a wind farm provided with a wind power generator comprising the steps of:
  • the wind power generator is allocated reactive power to be supplied or absorbed, and an instruction for instructing the wind power generator to generate the distributed reactive power is sent to the wind power generator.
  • a control apparatus for a wind farm the wind farm being provided with a wind turbine, the apparatus comprising:
  • a power grid detection module for detecting voltage and current of a wind farm
  • a communication interface for receiving a power grid dispatch signal
  • a first grid policy module for calculating reactive power based on voltage and current; calculating an ideal reactive power of the wind farm based on the grid dispatching signal; calculating a reactive power difference between the ideal reactive power and the reactive power;
  • the first fan control module is configured to monitor the current wind speed information of the wind turbine and the operation information of the wind turbine to obtain the output margin of the wind turbine; and allocate the wind turbine according to the reactive power difference and the output margin
  • the reactive power is provided or absorbed and an instruction is sent to the wind turbine to instruct the wind turbine to generate the distributed reactive power.
  • a wind power generation system comprising:
  • At least one wind turbine set on the collection line wherein the collection line is connected to the low voltage bus, and after being boosted by the transformer, the high voltage bus is connected, and the high voltage bus is connected by the grid connection point;
  • Each of the control devices described above is connected to each of the wind turbines via a communication line.
  • FIG. 1 is a schematic structural view of a wind power generation system according to some embodiments of the present invention.
  • FIG. 2 is a schematic flow chart of a control method for a wind farm according to some embodiments of the present invention.
  • FIG. 3 is a diagram showing the sub-flow of FIG. 2, in accordance with some embodiments of the present invention.
  • FIG. 4 is a diagram showing the sub-flow of FIG. 2, in accordance with some embodiments of the present invention.
  • Figure 5 is a diagram showing the sub-flow of Figure 2, in accordance with some embodiments of the present invention.
  • FIG. 6 is a schematic structural view of a control device for a wind farm according to some embodiments of the present invention.
  • FIG. 7 is a block diagram showing the structure of the first grid policy module of FIG. 6 according to some embodiments of the present invention.
  • FIG. 8 is a block diagram showing the structure of the first power grid policy module of FIG. 6 according to still another embodiment of the present invention.
  • FIG. 9 is a block diagram showing the structure of the first power grid policy module of FIG. 6 according to other embodiments of the present invention.
  • Figure 10 is a block diagram showing the structure of a control device for a wind farm according to some embodiments of the present invention.
  • Figure 11 is a block diagram showing the structure of a control device for a wind farm according to some embodiments of the present invention.
  • Figure 12 is a block diagram showing the structure of a control device for a wind farm according to some embodiments of the present invention.
  • FIG. 1 is a schematic structural view of a wind power generation system according to some embodiments of the present invention.
  • the system may include a transformer 3000, a control device 1000 for a wind farm, and a fan group 5000.
  • the wind turbine group 5000 may include a plurality of wind turbines 5001 disposed on the collection lines 1-N.
  • the collection line 1-N is connected to the low-voltage bus, and is boosted by the transformer 3000, and then connected to the high-voltage bus, and connected to the power grid 2000 through the connection line via the grid connection point.
  • the control device 1000 is connected to the wind turbine 5001 via a communication line, distributes the reactive power to be supplied or absorbed to the wind turbine 5001, and/or distributes the active power to be supplied.
  • the system can also be provided with a power compensation device 4000, a power compensation device Set 4000 to the low voltage bus.
  • the control device 1000 is connected to the power compensation device 4000 via a communication line, and controls the power compensation device 4000 to emit or absorb reactive power according to the grid-connected point voltage and frequency variation.
  • the system may further include a PT (voltage sensor) and a CT (current sensor) disposed at a grid point, and the control device 1000 connects the PT and the CT to detect voltage data and current data of the grid point.
  • a PT voltage sensor
  • CT current sensor
  • the grid 2000 can send a grid dispatch signal to the control device 1000 via the dispatch center server.
  • Transformer 3000 can be a boost device.
  • the power compensation device 4000 may include devices such as SVC or SVG.
  • the control device 1000 can acquire the power grid dispatching signal, can detect the PT (voltage sensor) and the CT (current sensor) of the grid-connected point, and can also perform information interaction with each wind turbine generator set 5001 in the wind turbine group 5000, thereby The voltage, frequency, active power and reactive power are controlled.
  • Control device 1000 may be a virtual synchronous generator, as will be described in more detail below.
  • the system may also include ancillary network communication devices such as routers, wired, wireless communication links, or fiber optic cables.
  • ancillary network communication devices such as routers, wired, wireless communication links, or fiber optic cables.
  • the number of settings of the wind turbine generator or the like in FIG. 1 is merely illustrative and can be flexibly adjusted according to implementation requirements.
  • the power compensation device 4000 can be arranged or even eliminated in small amounts.
  • FIG. 2 is a schematic flow chart of a control method for a wind farm according to some embodiments of the present invention.
  • the voltage sensor PT and the current sensor CT of the wind farm grid point can be detected, and the reactive power of the grid point can be calculated based on the detected voltage U and current I.
  • the grid information may include, for example, information such as the frequency f of the power grid and the frequency change rate ⁇ f, the grid voltage V and the voltage change rate ⁇ V, and the active power P of the Internet.
  • a power grid dispatch signal is received, and an ideal reactive power is calculated based on the power grid dispatch signal.
  • the calculation method of ideal reactive power is related to the current control mode.
  • the calculation mode can be different under different control modes. The content of this part will be described in detail below.
  • the reactive power difference between the ideal reactive power and the calculated reactive power is calculated. Specifically, the reactive power difference can be directly calculated by subtraction for the ideal reactive power and the calculated reactive power.
  • the current wind speed information may be an average value of current wind speed information around each wind turbine set, or may be an average value of wind speed values collected from blades of each wind power generator set, or may be The average of the wind speed values collected from any location around the wind turbines.
  • the current wind speed information of a specific wind turbine generator can be actively collected or passively received according to actual needs, and the content is not limited in this aspect.
  • the operation information of the wind turbine includes but is not limited to: temperature of the wind turbine converter, temperature of the generator set, temperature of the pitch system, and the like.
  • the wind power generator is allocated reactive power to be supplied or absorbed, and the wind power generator is sent an instruction for instructing the wind power generator to generate the allocated reactive power.
  • the wind power generators may be allocated a reactive power that is to be distributed according to the ratio of the output margins of the wind turbines according to the principle of equal ratio. Wind turbines with high output margins have high reactive power, and wind turbines with low output margins have relatively low reactive power. It should be understood that the sum of the reactive power of these wind turbines should meet the requirements of the grid point. In some instances, an average distribution may also be made when the output margins of the various wind turbines are not significantly different. In some instances, it is also possible to first detect the health of each wind turbine and assign it after considering the health factor.
  • the reactive power is calculated by detecting the voltage and current of the grid connection point, and the ideal reactive power is obtained according to the power grid scheduling signal, thereby calculating the reactive power difference;
  • the current wind speed information and operation information of the generator set are used to obtain the output margin of the wind turbine;
  • the reactive power is allocated to the wind turbine by the reactive power difference and the output margin.
  • the embodiment of the present invention allocates reactive power to the wind turbine combination by referring to the output margin, and controls the wind power generator to actively emit or absorb appropriate reactive power, thereby fully exerting the capabilities of each wind power generator and reducing the existing technology.
  • the pressure of equipment such as reactive power compensation can even control the wind turbine generating or absorbing appropriate reactive power to effectively compensate the power value of the grid point when the equipment such as reactive power compensation is omitted, and the reactive power is greatly reduced.
  • the compensation work of compensation and other equipment can greatly reduce the energy consumed by the reactive power compensation equipment and reduce the equipment cost.
  • FIG. 3 is a diagram showing some of the sub-flows of FIG. 2 of some embodiments.
  • FIG. 3 shows the first implementation of the above step S220 (ie, receiving the grid scheduling signal and calculating the ideal reactive power based on the grid scheduling signal).
  • the current control mode is set to the reactive power control mode in advance.
  • the ideal reactive power is directly given by the power grid dispatching signal, or the ideal reactive power is set as a preset target value.
  • the ideal reactive power is directly given by the power grid dispatching signal, or the ideal reactive power is set to a preset target value, and the operation is simple and convenient, and the wind power generating set can be quickly controlled.
  • FIG. 4 is a diagram showing some sub-flows of FIG. 2 of some embodiments.
  • FIG. 4 shows a second implementation of the above step S220 (ie, receiving a grid dispatch signal and calculating an ideal reactive power based on the grid dispatch signal).
  • the current control mode is set to the voltage control mode in advance.
  • the system impedance of the grid point is calculated based on the grid voltage and current.
  • This impedance X can also be obtained by actual measurement. Or, give the system a reactive excitation (given ⁇ Q, the given reactive power change value before reactive excitation and reactive excitation), and check the system voltage change ⁇ U (before reactive excitation and reactive excitation) After the change in voltage)).
  • the target voltage is acquired based on the grid scheduling signal.
  • the ideal reactive power is calculated based on the target voltage, the grid voltage, the reactive power, and the impedance.
  • the ideal reactive power is calculated based on the target voltage, the grid voltage, the reactive power, and the impedance, and the obtained data has high precision, ensuring the accuracy of the control.
  • the expression for calculating the ideal reactive power can be:
  • Uref is the target voltage
  • U is the grid-connected point voltage
  • X is the grid-connected point impedance
  • Q is the grid-connected reactive power
  • Qref is the ideal reactive power
  • FIG. 5 is a diagram showing the sub-flow of FIG. 2 in some embodiments.
  • FIG. 5 shows a third implementation manner of the above step S220 (ie, receiving the power grid scheduling signal and calculating the ideal reactive power based on the power grid scheduling signal).
  • the current control mode is set in advance to the power factor control mode.
  • the active power is calculated based on the voltage and current of the grid connection point
  • the target power factor is acquired based on the grid scheduling signal.
  • the ideal reactive power is calculated based on the target power factor and the active power.
  • the ideal reactive power is calculated based on the target power factor and the active power, and the obtained data has high precision, ensuring the accuracy of the control.
  • the expression for calculating the ideal reactive power can be:
  • the following steps may be added on the basis of the embodiment of FIG. 2: determining an ideal active power according to a power grid scheduling signal; calculating a power difference between an ideal active power and an actual active power; and The power difference and the output margin allocate the active power to be provided for the wind turbine and send an instruction to the wind turbine to instruct the wind turbine to generate the allocated active power.
  • the calculating step of the ideal active power may include:
  • the frequency change rate of the grid-connected point is calculated.
  • the ideal active power is obtained based on the frequency change rate and the preset reference table, wherein the preset reference table may be included in the power grid scheduling information, and may include: an ideal active power and a frequency change rate corresponding to the ideal active power.
  • the ideal active power can also be calculated from the grid information.
  • the embodiment of the invention can not only allocate reactive power, but also allocate active power, increase functions, and can meet the requirements of active power and reactive power of the wind farm.
  • the embodiment of the present invention can adjust the output reactive power Q and the active power P of the wind turbine in real time according to the output voltage and the output power set by the large power grid, so that the voltage V and the power P of the entire wind farm grid-connected point are close to the power grid.
  • the fixed scheduling value and the steady state stability are close to the power grid.
  • the embodiment of the invention can also ensure that the active power P and the reactive power Q output by the wind turbine are effectively controlled under different wind conditions, and the transient stability (voltage V and frequency f stability) of the grid point is improved.
  • the embodiment of the invention can also perform centralized control on multiple units when performing wind power generator or wind farm frequency stability and voltage stability control, and can be flexibly allocated according to different unit operating conditions to ensure the final control effect is optimal.
  • the above embodiment can control the wind power generator to actively emit appropriate reactive power, reduce the pressure of the centralized reactive power compensation equipment such as SVC and SVG in the prior art, reduce the manufacturing cost of the equipment, and even omit the SVC and SVG equipment, so that the wind power generator set The reactive power generated can compensate for the voltage value required for the grid connection.
  • the following steps may be added on the basis of the foregoing embodiments: determining the health status values of one or more wind turbines according to the operation information of the wind turbine; and The state value is compared with the preset health threshold, and the wind turbine with the health state value greater than the preset health threshold is determined as the healthy wind turbine, and only the reactive power and/or need to be provided or absorbed are allocated to the healthy wind turbine. The active power provided.
  • the following steps may be added to the above embodiments: when there are multiple healthy wind turbines, according to the principle of equalization or the principle of equal ratio, for each healthy wind power generation
  • the unit distributes reactive power and/or active power equally.
  • the embodiment of the invention considers that various faults may occur in the running process of the wind power generator set, and can collect and sort the health state information of each wind power generator set in real time. The wind turbine set above the health threshold is then selected to participate in reactive power Q and active power P regulation.
  • the wind farm includes n wind turbines, two of which are below the threshold, only the n-2 wind turbines whose health is above the threshold are adjusted.
  • the same reactive power can be assigned to each wind turbine that meets health requirements based on the principle of sharing.
  • the active power is equally distributed according to their output margin, and the wind power generator with high output margin is allocated with high active power.
  • Low-power wind turbines distribute relatively low active power. It can be understood that other allocations can also be made according to actual needs. For the sake of brevity, the content of this part will not be described again.
  • FIG. 6 is a schematic structural view of a control device for a wind farm according to some embodiments of the present invention.
  • control device 1000 for a wind farm may include: a grid detection module 100, a communication interface 200, a first grid policy module 300, and a first fan control module 400.
  • the grid detection module 100 can be used to detect the voltage and current of the grid connection point of the wind farm.
  • the communication interface 200 can be used to receive a power grid dispatch signal.
  • the first grid policy module 300 can calculate the reactive power of the grid-connected point based on the voltage and current; and calculate the ideal of the wind farm based on the grid dispatching signal Work power; calculate the reactive power difference between ideal reactive power and reactive power.
  • the first fan control module 400 can be used to monitor the current wind speed information of the wind turbine and the operation information of the wind turbine to obtain the output margin of the wind turbine; according to the reactive power difference and the output margin, the wind turbine The reactive power to be supplied or absorbed is distributed and an instruction is sent to the wind turbine to instruct the wind turbine to generate the distributed reactive power.
  • the illustrated functional unit or functional module may be implemented in hardware, software, firmware, or a combination thereof.
  • it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, plug-ins, function cards, and the like.
  • ASIC application specific integrated circuit
  • the elements of the present invention are programs or code segments that are used to perform the required tasks.
  • the program or code segments can be stored in a machine readable medium or transmitted over a transmission medium or communication link through a data signal carried in the carrier.
  • a "machine-readable medium” can include any medium that can store or transfer information.
  • machine readable media examples include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like.
  • the code segments can be downloaded via a computer network such as the Internet, an intranet, and the like.
  • FIG. 7 is a schematic diagram showing the structure of the first grid policy module of FIG. 6 of some embodiments.
  • the first power grid policy module 300 may include: a first mode setting unit 301 and a first power setting unit 302.
  • the first mode setting unit 301 can be configured to set the current control mode to the reactive power control mode in advance.
  • the first power setting unit 302 can be used to directly specify the ideal reactive power from the power grid scheduling signal or set the ideal reactive power to the preset target value in the reactive power control mode.
  • FIG. 8 is a schematic diagram showing the structure of the first grid policy module of FIG. 6 in still other embodiments.
  • the first grid policy module 300 may include a second mode setting unit 303, an impedance acquiring unit 304, a voltage acquiring unit 305, and a second power calculating unit 306.
  • the second mode setting unit 303 can be configured to set the current control mode to the voltage control mode in advance.
  • the impedance acquisition unit 304 can calculate the impedance of the grid-connected point based on the grid-connected point voltage and current.
  • the voltage acquisition unit 305 can be used to, based on the grid scheduling signal, in the voltage control mode, Get the target voltage.
  • the second power calculation unit 306 can calculate the ideal reactive power based on the target voltage, the grid voltage, the reactive power, and the impedance.
  • the second power calculation unit 306 can calculate the ideal reactive power using the following expression:
  • Uref-U X*(Q-Qref), where Uref is the target voltage, U is the grid-connected point voltage, X is the grid-connected point impedance, Q is the grid-connected reactive power, and Qref is the ideal reactive power.
  • FIG. 9 is a schematic diagram showing the structure of the first grid policy module of FIG. 6 in still other embodiments.
  • the first grid policy module 300 may include a third mode setting unit 307, a power calculation unit 308, a power factor acquisition unit 309, and a third power calculation unit 310.
  • the third mode setting unit 307 can be used to set the current control mode to the power factor control mode in advance.
  • the power calculation unit 308 can calculate the active power based on the grid voltage and current.
  • the power factor acquisition unit 309 can be configured to acquire a target power factor based on the grid scheduling signal in the power factor control mode.
  • the third power calculation unit 310 can calculate the ideal reactive power based on the target power factor and the active power.
  • the third power calculation unit 310 can calculate the ideal reactive power using the following expression:
  • Figure 10 is a block diagram showing the structure of a control device for a wind farm according to some embodiments of the present invention.
  • the embodiment shown in FIG. 10 is a modified embodiment of the embodiment of FIG. 6.
  • the second grid policy module 500 and the second fan control module 600 can be added to the embodiment of FIG. 6.
  • the second grid policy module 500 can be coupled to the communication interface 200 and the second fan control module 600, respectively.
  • the second grid policy module 500 can be configured to calculate an ideal active power based on the grid scheduling signal and the grid information; and calculate a power difference between the ideal active power and the active power.
  • the second fan control module 600 can be configured to allocate the active power to be provided to the wind turbine according to the active power difference and the output margin, and send the wind turbine to indicate the wind turbine generation. With the instruction of active power.
  • the second grid policy module 500 can include a frequency calculation unit and a power selection unit.
  • the frequency calculation unit can calculate the frequency change rate of the grid-connected point based on the grid-connected point voltage and current.
  • the power selection unit may obtain the ideal active power based on the frequency change rate and the preset reference table, wherein the preset reference table includes: an ideal active power and a frequency change rate corresponding to the ideal active power.
  • FIG. 11 is a schematic structural view of a control device for a wind farm according to still another embodiment of the present invention.
  • the embodiment shown in FIG. 11 is a further modified embodiment of the embodiment of FIG. 6.
  • the health detection module 700 can be added to the embodiment of FIG. 6.
  • the health detection module 700 can be coupled to the first grid policy module 300 and the first fan control module 400, respectively.
  • the health detection module 700 can be configured to determine a health status value of one or more wind turbines according to operation information of the wind power generator; compare the health status value with a preset health threshold, and set the health status value to be greater than a preset health status
  • the threshold wind turbine is determined to be a healthy wind turbine; only the healthy wind turbines are allocated reactive power to be supplied or absorbed, and/or active power to be supplied.
  • Figure 12 is a block diagram showing the structure of a control device for a wind farm according to still another embodiment of the present invention.
  • the embodiment shown in FIG. 12 is a further modified embodiment of the embodiment of FIG. 6.
  • the health detection module 700 and the principle selection module 800 can be added to the embodiment of FIG. 6.
  • the health detection module 700 is coupled to the first grid policy module 300.
  • the principle selection module 800 is connected to the health detection module 700 and the first fan control module 400, respectively.
  • principle selection module 800 is configured to allocate reactive power to be provided or absorbed to each healthy wind power generator according to the principle of equalization or according to the principle of equal ratio when the number of healthy wind power generator sets is multiple, and/or need to provide Active power.
  • the control device for the wind farm may be a virtual synchronous generator.
  • the virtual synchronous generator can detect the voltage and current of the wind turbine or the wind farm at the grid point through the grid detection module, and calculate the frequency f of the grid, the frequency change rate ⁇ f, the grid voltage V, and the voltage. The rate of change ⁇ V, the grid reactive power Q of the wind farm and the active power P and other grid information.
  • the grid information is then passed to the grid policy module in real time.
  • the grid policy module communicates with the power system to obtain the grid dispatching signal.
  • the grid strategy module can calculate the ideal reactive power Qref and the ideal active power Pref that the current wind turbine or wind farm should emit based on the current grid condition of the wind farm.
  • the wind turbine control module monitors the wind turbine's current wind speed information and other important information, determines the wind turbine's operating state and output margin, and then issues instructions to each wind turbine based on the entire ideal Qref and PREF. And controlling the reactive power Q_wt and active power P_wt generated by each unit, and finally bringing the total reactive power Q and the total active power P of the entire wind farm grid point to or near Qref and Pref.
  • the calculation expression of the total reactive power Q can be:
  • Q total Q1_wt + Q2_wt + ... + Qn_wt, Q1_wt, Q2_wt, Qn_wt respectively represent the reactive power of the first fan, the second fan and the nth fan in the wind farm.
  • the total calculation expression of the total active power P can be:
  • P total P1_wt + P2_wt + ... + Pn_wt, P1_wt, P2_wt, Pn_wt respectively represent the active power from the first fan, the second fan and the nth fan in the wind farm.
  • the virtual synchronous generator detects the frequency of the grid connection point of the wind turbine or the wind farm at f0 as f0 and the frequency change rate ⁇ f0, the grid voltage is V0 and the voltage change rate ⁇ V0, the on-grid reactive power Q0 and the active power P0 of the wind farm .
  • the grid policy module judges that the current grid frequency f0 is low and exceeds the set threshold, and further determines that the current system frequency rapidly drops by the frequency change rate ⁇ f0 value, thus confirming that the frequency is low.
  • the grid strategy module calculates the ideal active power control value Pref0 of the wind farm.
  • the virtual synchronous generator receives the voltage control value Vref0 of the grid dispatch, and the grid strategy module calculates the ideal wind farm based on the grid voltage V0 and the voltage control value Vref0. Reactive power Qref0.
  • the fan control module will fine-tune and intervene to control the active power and reactive power of each wind turbine according to the current wind speed information of the wind turbine and other grid-connected power generation information, so that the sum of the reactive power of each wind turbine generator reaches or approaches Qref, so that the sum of the active power of each unit reaches or continuously approaches Pref.
  • the grid connection point is at the output P and After the Q changes, the corresponding voltage also returns to the normal range, and the system frequency tends to the normal range.
  • the virtual synchronous generator of the embodiment of the invention can monitor the state of the grid of the wind farm or the wind turbine by the wind farm. When the grid system has a voltage or frequency running deviation, the device will issue a control command to the wind turbine to properly adjust the wind power generation.
  • the active power P and the reactive power Q output by the unit stabilize the voltage at the grid-connected point of the wind farm and assist the system to stabilize its frequency.
  • the virtual synchronous generator can make the operation of the wind farm or wind turbine smoother, reduce the impact on the power grid, and improve the safety and stability margin of the power grid.
  • control device of each of the above embodiments can be used as an execution body in the control method of each of the above embodiments, and the corresponding flow in each method can be implemented.
  • a person skilled in the art can clearly understand that the specific working process of the hardware, the device, and the like described above may refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again.
  • the present invention also proposes a wind power generation system.
  • the system may include: at least one wind turbine 5001 disposed on the collecting line 1-N, wherein the collecting line is connected to the low voltage bus, and after being boosted by the transformer 3000, the high voltage bus is connected, and the high voltage bus is connected by The outlet is connected to the line.
  • the control device 1000 respectively connects the wind turbines via the communication line, distributes the reactive power to be supplied or absorbed for each wind turbine, and/or distributes the active power to be provided.
  • the wind power generation system further includes a power compensation device 4000 connected to the low voltage bus, and the control device 1000 is connected to the power compensation device 4000 via the communication line, and controls the power compensation device 4000 to emit or absorb reactive power.
  • the system can also include other power devices, such as a battery pack, an electric meter, a wire, a network cable, etc., and can be flexibly combined according to actual needs.
  • power devices such as a battery pack, an electric meter, a wire, a network cable, etc.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interface, indirect coupling or communication connection of the device, or electrical, mechanical or other form of connection.
  • hardware for example, various calculators in various embodiments of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

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  • Control Of Eletrric Generators (AREA)

Abstract

L'invention concerne un procédé et un dispositif de commande pour un parc éolien, et un système de génération de puissance éolienne. Le procédé consiste : à détecter la tension et le courant d'un point de connexion au réseau électrique d'un parc éolien, et à calculer la puissance réactive du point de connexion au réseau électrique (S210) ; à recevoir un signal de répartition du réseau électrique, et à déterminer, sur la base du signal de répartition du réseau électrique, la puissance réactive idéale du parc éolien (S220) ; à calculer une valeur de différence de puissance réactive entre la puissance réactive idéale et la puissance réactive (S230) ; à surveiller des informations actuelles de vitesse du vent concernant un système générateur à turbine éolienne et des informations de fonctionnement concernant le système générateur à turbine éolienne pour obtenir la marge de rendement du système générateur à turbine éolienne (S240) ; et en fonction de la valeur de différence de puissance réactive et de la marge de rendement, à attribuer, au système générateur à turbine éolienne, la puissance réactive devant être appliquée ou absorbée, et à envoyer au système générateur à turbine éolienne, une instruction destinée à ordonner au système générateur à turbine éolienne de produire la puissance réactive attribuée (S250).
PCT/CN2017/096412 2016-12-12 2017-08-08 Procédé et dispositif de contrôle de parc éolien, et système de génération de puissance éolienne WO2018107775A1 (fr)

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